The high spectral resolution of SPIRE is used to place limits on the presence of PH3 in Saturn’s stratosphere. Using the best-fitting parameterised profiles from Fig. 6, we apply upper-level cutoffs between 1 mbar and 300 mbar and test the change in χ2. The upper panels show the data (points) compared to models with high-altitude cut offs at different pressure levels (key shown in mbar in the upper left panel). The lower panels show Δχ2 for the variable cutoff pressure with 1σ and 3σ confidence limits as the dotted horizontal lines.
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